I have about 150 hours behind a C182B with the sportsman STOL. I didn't fly this particular airplane without the kit, because it's had it for a few decades, but compared to some later (heavier) 182's without the kit, it almost should not even be the same type IMHO.
It is pretty good. The airplane just kind of mushes at 40 mph with the power off and doesn't really break at all because there isn't enough elevator authority to get the AoA high enough, even with full nose up stab trim. With power on, you can slow down to about 40 mph groundspeed at medium weights, maintain altitude, and it just starts descending at a few hundred feet per minute once you exceed a certain AoA....I've stopped the airplane before in 300 feet with just me in it and half tanks on a calm standard day. It'll take off in about 500 feet under the same conditions, about 2100 lbs gross weight. This airplane isn't even as good as it could be, it's kind of piggy at ~1700 lbs empty weight.
You can strike the tail easily during takeoffs and landings with this kit though. A tail skid under the tie down hook might be a good idea unless of course you are fortuante enough to have a skywagon!
Downside is this airplane only does about 142 mph TAS maximum at 23"/2450 (which is POH max continuous power) at 6000-7000 ft depending on atmospheric conditions. That's about 20 mph slower than the 1959 POH claims. VG's, bubble windows, and 8.50x6's all around aren't helping that. I'd guess it does cost 3-5 mph on the top end, even though I know people claim it doesn't. Then again, maybe it's just all the other stuff on the airplane that's slowing it a bit.
I make approaches at 60 mph IAS all day long and the stall horn isn't even going off at 2300-2400 lbs. You could comfortably fly an approch at 55 mph IAS or so, granted that is about 63 mph CAS. You have to be cautious in gusty wind though, definitely use flaps 20, maaaaybe 30 max, add 5 mph or so to your normal approach speeds and be ready to add a lot of power if you get a sinker on short final.
Here is a ~400 foot landing roll with calm winds, granted a bit of an uphill grade to help. It is no problem. I don't think I was braking all that hard either.